.TH "QwtPlotTextLabel" 3 "Mon Jun 1 2020" "Version 6.1.5" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtPlotTextLabel \- A plot item, which displays a text label\&.  

.SH SYNOPSIS
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.PP
.PP
\fC#include <qwt_plot_textlabel\&.h>\fP
.PP
Inherits \fBQwtPlotItem\fP\&.
.SS "Public Member Functions"

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.RI "\fBQwtPlotTextLabel\fP ()"
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.RI "Constructor\&. "
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.RI "virtual \fB~QwtPlotTextLabel\fP ()"
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.RI "Destructor\&. "
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.RI "virtual int \fBrtti\fP () const"
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.RI "void \fBsetText\fP (const \fBQwtText\fP &)"
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.RI "\fBQwtText\fP \fBtext\fP () const"
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.RI "void \fBsetMargin\fP (int \fBmargin\fP)"
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.RI "int \fBmargin\fP () const"
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.RI "virtual QRectF \fBtextRect\fP (const QRectF &, const QSizeF &) const"
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.RI "Align the text label\&. "
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.SS "Protected Member Functions"

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.RI "virtual void \fBdraw\fP (QPainter *, const \fBQwtScaleMap\fP &, const \fBQwtScaleMap\fP &, const QRectF &) const"
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.RI "void \fBinvalidateCache\fP ()"
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.RI "Invalidate all internal cache\&. "
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.SS "Additional Inherited Members"
.SH "Detailed Description"
.PP 
A plot item, which displays a text label\&. 

\fBQwtPlotTextLabel\fP displays a text label aligned to the plot canvas\&.
.PP
In opposite to \fBQwtPlotMarker\fP the position of the label is unrelated to plot coordinates\&.
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As drawing a text is an expensive operation the label is cached in a pixmap to speed up replots\&.
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\fBExample\fP
.RS 4
The following code shows how to add a title\&. 
.PP
.nf
QwtText title( "Plot Title" );
title\&.setRenderFlags( Qt::AlignHCenter | Qt::AlignTop );

QFont font;
font\&.setBold( true );
title\&.setFont( font );

QwtPlotTextLabel *titleItem = new QwtPlotTextLabel();
titleItem->setText( title );
titleItem->attach( plot );

.fi
.PP
 \\endpar
.RE
.PP
\fBSee also\fP
.RS 4
\fBQwtPlotMarker\fP 
.RE
.PP

.SH "Constructor & Destructor Documentation"
.PP 
.SS "QwtPlotTextLabel::QwtPlotTextLabel ()"

.PP
Constructor\&. Initializes an text label with an empty text
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Sets the following item attributes:
.PP
.IP "\(bu" 2
\fBQwtPlotItem::AutoScale\fP: true
.IP "\(bu" 2
\fBQwtPlotItem::Legend\fP: false
.PP
.PP
The z value is initialized by 150
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\fBSee also\fP
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\fBQwtPlotItem::setItemAttribute()\fP, \fBQwtPlotItem::setZ()\fP 
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.PP

.SH "Member Function Documentation"
.PP 
.SS "void QwtPlotTextLabel::draw (QPainter * painter, const \fBQwtScaleMap\fP & xMap, const \fBQwtScaleMap\fP & yMap, const QRectF & canvasRect) const\fC [protected]\fP, \fC [virtual]\fP"
Draw the text label
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\fBParameters\fP
.RS 4
\fIpainter\fP Painter 
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\fIxMap\fP x Scale Map 
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\fIyMap\fP y Scale Map 
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\fIcanvasRect\fP Contents rectangle of the canvas in painter coordinates
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\fBSee also\fP
.RS 4
\fBtextRect()\fP 
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.PP
Implements \fBQwtPlotItem\fP\&.
.SS "int QwtPlotTextLabel::margin () const"

.PP
\fBReturns\fP
.RS 4
Margin added to the contentsMargins() of the canvas 
.RE
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\fBSee also\fP
.RS 4
\fBsetMargin()\fP 
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.SS "int QwtPlotTextLabel::rtti () const\fC [virtual]\fP"

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\fBReturns\fP
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\fBQwtPlotItem::Rtti_PlotTextLabel\fP 
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.PP

.PP
Reimplemented from \fBQwtPlotItem\fP\&.
.SS "void QwtPlotTextLabel::setMargin (int margin)"
Set the margin
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The margin is the distance between the contentsRect() of the plot canvas and the rectangle where the label can be displayed\&.
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\fBParameters\fP
.RS 4
\fImargin\fP Margin
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\fBSee also\fP
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\fBmargin()\fP, \fBtextRect()\fP 
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.SS "void QwtPlotTextLabel::setText (const \fBQwtText\fP & text)"
Set the text
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The label will be aligned to the plot canvas according to the alignment flags of text\&.
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\fBParameters\fP
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\fItext\fP Text to be displayed
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\fBSee also\fP
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\fBtext()\fP, \fBQwtText::renderFlags()\fP 
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.SS "\fBQwtText\fP QwtPlotTextLabel::text () const"

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\fBReturns\fP
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Text to be displayed 
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\fBSee also\fP
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\fBsetText()\fP 
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.SS "QRectF QwtPlotTextLabel::textRect (const QRectF & rect, const QSizeF & textSize) const\fC [virtual]\fP"

.PP
Align the text label\&. 
.PP
\fBParameters\fP
.RS 4
\fIrect\fP Canvas rectangle with margins subtracted 
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\fItextSize\fP Size required to draw the text
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\fBReturns\fP
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A rectangle aligned according the the alignment flags of the text\&.
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\fBSee also\fP
.RS 4
\fBsetMargin()\fP, \fBQwtText::renderFlags()\fP, \fBQwtText::textSize()\fP 
.RE
.PP


.SH "Author"
.PP 
Generated automatically by Doxygen for Qwt User's Guide from the source code\&.
